Method and system for precise-clock synchronization, and device for precise-clock frequency/time synchronization

a clock synchronization and frequency synchronization technology, applied in the field of communication technology, can solve the problems of inability to perform correct calculation according to the obtained time stamp, too much link bandwidth resources are occupied in the foresaid process, and the clock synchronization occupies too much link bandwidth resources, so as to achieve the effect of greatly reducing the occupied link bandwidth resources
US20100098111A1Inactive Publication Date: 2010-04-22HUAWEI TECH CO LTD
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
HUAWEI TECH CO LTD
Publication Date
2010-04-22
Estimated Expiration
Not applicable · inactive patent

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Abstract

A precise-clock synchronization method and system and a precise-clock frequency / time synchronization device are provided. In the embodiments of the present invention, two time stamp engines are provided at a slave clock side. A relative time stamp engine provides a relative arrival time stamp. An absolute time stamp engine provides an absolute arrival time stamp. The frequency / time synchronization is calculated by using different time stamps obtained from different time stamp engines, so the frequency synchronization and time synchronization of master clock and the slave clock may be separately accomplished, and one synchronization function may be enabled or disabled. Therefore, the frequency synchronization and time synchronization of the master clock and the slave clock do not interfere with each other, thus greatly reducing the occupied link bandwidth resources.
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Description

CROSS-REFERENCE TO RELATED APPLICATION

[0001] This application claims priority to Chinese Patent Application No. 200810224615.7, filed Oct. 21, 2008, the content of which is hereby incorporated by reference in its entirety.FIELD OF THE TECHNOLOGY

[0002] The present invention relates to the field of communication technology, and more particularly, to a method and system for precise-clock synchronization and a device for precise-clock frequency / time synchronization.BACKGROUND OF THE INVENTION

[0003] IP-based communication networks have not reduced demands for clock synchronization. On the contrary, for demands of cost, safety, and services, the IP clock synchronization becomes more and more important. Among the various existing IP clock technologies, such as circuit emulation services over packet switched (CESoP), timing over packet (ToP), network time protocol (NTP), the ToP technology is a relatively new technology. For the IP clock technology, the IEEE also introduced an IEEE 1588 precis...

Claims

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